sim/msp430/trace.c

   1 /* trace.c --- tracing output for the MSP430 simulator.
   2
   3    Copyright (C) 2005-2015 Free Software Foundation, Inc.
   4    Contributed by Red Hat, Inc.
   5
   6    This file is part of the GNU simulators.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22
  23 #include "config.h"
  24 #include <stdio.h>
  25 #include <stdarg.h>
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <ctype.h>
  31
  32 #include "libiberty.h"
  33 #include "bfd.h"
  34 #include "dis-asm.h"
  35 #include "trace.h"
  36
  37 static int
  38 sim_dis_read (bfd_vma memaddr, bfd_byte * ptr, unsigned int length,
  39               struct disassemble_info *info)
  40 {
  41   return 0;
  42 }
  43
  44 /* Filter out (in place) symbols that are useless for disassembly.
  45    COUNT is the number of elements in SYMBOLS.
  46    Return the number of useful symbols. */
  47
  48 static long
  49 remove_useless_symbols (asymbol ** symbols, long count)
  50 {
  51   asymbol **in_ptr = symbols, **out_ptr = symbols;
  52
  53   while (-- count >= 0)
  54     {
  55       asymbol *sym = *in_ptr ++;
  56
  57       if (strstr (sym->name, "gcc2_compiled"))
  58         continue;
  59       if (sym->name == NULL || sym->name[0] == '\0')
  60         continue;
  61       if (sym->flags & (BSF_DEBUGGING))
  62         continue;
  63       if (bfd_is_und_section (sym->section)
  64           || bfd_is_com_section (sym->section))
  65         continue;
  66
  67       if (sym->name[0] == '.' && sym->name[1] == 'L')
  68         continue;
  69
  70       /* If the symbol ends in ^A or ^B it is
  71          an assembler generated local label.  */
  72       if (sym->name[strlen (sym->name) - 1] < 32)
  73         continue;
  74
  75       *out_ptr++ = sym;
  76     }
  77   return out_ptr - symbols;
  78 }
  79
  80 static int
  81 compare_symbols (const PTR ap, const PTR bp)
  82 {
  83   const asymbol *a = *(const asymbol **) ap;
  84   const asymbol *b = *(const asymbol **) bp;
  85
  86   if (bfd_asymbol_value (a) > bfd_asymbol_value (b))
  87     return 1;
  88   else if (bfd_asymbol_value (a) < bfd_asymbol_value (b))
  89     return -1;
  90   return 0;
  91 }
  92
  93 static char opbuf[1000];
  94
  95 static int
  96 op_printf (char *buf, char *fmt, ...)
  97 {
  98   int ret;
  99   va_list ap;
 100
 101   va_start (ap, fmt);
 102   ret = vsprintf (opbuf + strlen (opbuf), fmt, ap);
 103   va_end (ap);
 104   return ret;
 105 }
 106
 107 static bfd *       current_bfd = NULL;
 108 static asymbol **  symtab = NULL;
 109 static int         symcount = 0;
 110 static asection *  code_section = NULL;
 111 static bfd_vma     code_base = 0;
 112 static struct disassemble_info info;
 113
 114 void
 115 msp430_trace_init (bfd *prog)
 116 {
 117   current_bfd = prog;
 118 }
 119
 120 typedef struct Files
 121 {
 122   struct Files *next;
 123   char *filename;
 124   int nlines;
 125   char **lines;
 126   char *data;
 127 } Files;
 128 Files *files = 0;
 129
 130 static char *
 131 load_file_and_line (const char *filename, int lineno)
 132 {
 133   Files *f;
 134   for (f = files; f; f = f->next)
 135     if (strcmp (f->filename, filename) == 0)
 136       break;
 137   if (!f)
 138     {
 139       int i;
 140       struct stat s;
 141       const char *found_filename, *slash;
 142       FILE *file;
 143
 144       found_filename = filename;
 145       while (1)
 146         {
 147           if (stat (found_filename, &s) == 0)
 148             break;
 149           slash = strchr (found_filename, '/');
 150           if (!slash)
 151             return "";
 152           found_filename = slash + 1;
 153         }
 154
 155       f = (Files *) xmalloc (sizeof (Files));
 156       f->next = files;
 157       files = f;
 158       f->filename = xstrdup (filename);
 159       f->data = (char *) xmalloc (s.st_size + 2);
 160       file = fopen (found_filename, "rb");
 161       fread (f->data, 1, s.st_size, file);
 162       f->data[s.st_size] = 0;
 163       fclose (file);
 164
 165       f->nlines = 1;
 166       for (i = 0; i < s.st_size; i ++)
 167         if (f->data[i] == '\n')
 168           f->nlines ++;
 169       f->lines = (char **) xmalloc (f->nlines * sizeof (char *));
 170       f->lines[0] = f->data;
 171       f->nlines = 1;
 172       for (i = 0; i < s.st_size; i ++)
 173         if (f->data[i] == '\n')
 174           {
 175             f->lines[f->nlines] = f->data + i + 1;
 176             while (*f->lines[f->nlines] == ' '
 177                    || *f->lines[f->nlines] == '\t')
 178               f->lines[f->nlines] ++;
 179             f->nlines ++;
 180             f->data[i] = 0;
 181           }
 182     }
 183   if (lineno < 1 || lineno > f->nlines)
 184     return "";
 185   return f->lines[lineno - 1];
 186 }
 187
 188 int
 189 msp430_get_current_source_location (int mypc,
 190                                     const char **  pfilename,
 191                                     const char **  pfunctionname,
 192                                     unsigned int * plineno)
 193 {
 194   static int   initted = 0;
 195
 196   if (current_bfd == NULL)
 197     {
 198       printf("no bfd\n");
 199       return 0;
 200     }
 201
 202   if (!initted)
 203     {
 204       int storage;
 205       asection * s;
 206
 207       initted = 1;
 208       memset (& info, 0, sizeof (info));
 209       INIT_DISASSEMBLE_INFO (info, stdout, op_printf);
 210       info.read_memory_func = sim_dis_read;
 211       info.arch = bfd_get_arch (current_bfd);
 212       info.mach = bfd_get_mach (current_bfd);
 213       if (info.mach == 0)
 214         info.arch = bfd_arch_msp430;
 215
 216       disassemble_init_for_target (& info);
 217
 218       storage = bfd_get_symtab_upper_bound (current_bfd);
 219       if (storage > 0)
 220         {
 221           symtab = (asymbol **) xmalloc (storage);
 222           symcount = bfd_canonicalize_symtab (current_bfd, symtab);
 223           symcount = remove_useless_symbols (symtab, symcount);
 224           qsort (symtab, symcount, sizeof (asymbol *), compare_symbols);
 225         }
 226
 227       for (s = current_bfd->sections; s; s = s->next)
 228         {
 229           if (s->flags & SEC_CODE || code_section == 0)
 230             {
 231               code_section = s;
 232               code_base = bfd_section_lma (current_bfd, s);
 233               break;
 234             }
 235         }
 236     }
 237
 238   *pfilename = *pfunctionname = NULL;
 239   *plineno = 0;
 240
 241   bfd_find_nearest_line
 242     (current_bfd, code_section, symtab, mypc - code_base,
 243      pfilename, pfunctionname, plineno);
 244
 245   return 1;
 246 }
 247
 248 void
 249 msp430_trace_one (int mypc)
 250 {
 251   static int           last_sym = -1;
 252   static const char *  prev_filename = "";
 253   static int           prev_lineno = 0;
 254   const char *  filename;
 255   const char *  functionname;
 256   unsigned int  lineno;
 257   int           sym, bestaddr;
 258   int           min, max, i;
 259
 260   if (! msp430_get_current_source_location (mypc, & filename, & functionname, & lineno))
 261     return;
 262
 263   if (filename && functionname && lineno)
 264     {
 265       if (lineno != prev_lineno || strcmp (prev_filename, filename))
 266         {
 267           char *       the_line = load_file_and_line (filename, lineno);
 268           const char * slash = strrchr (filename, '/');
 269
 270           if (!slash)
 271             slash = filename;
 272           else
 273             slash ++;
 274           fprintf
 275             (stderr, "========================================"
 276              "=====================================\n");
 277           fprintf (stderr, "\033[37;41m %s:%d: \033[33;40m %s\033[K\033[0m\n",
 278                   slash, lineno, the_line);
 279         }
 280       prev_lineno = lineno;
 281       prev_filename = filename;
 282     }
 283
 284   min = -1;
 285   max = symcount;
 286   while (min < max - 1)
 287     {
 288       bfd_vma sa;
 289
 290       sym = (min + max) / 2;
 291       sa = bfd_asymbol_value (symtab[sym]);
 292       /*printf ("checking %4d %08x %s\n",
 293         sym, sa, bfd_asymbol_name (symtab[sym])); */
 294       if (sa > mypc)
 295         max = sym;
 296       else if (sa < mypc)
 297         min = sym;
 298       else
 299         {
 300           min = sym;
 301           break;
 302         }
 303     }
 304
 305   if (min != -1 && min != last_sym)
 306     {
 307       bestaddr = bfd_asymbol_value (symtab[min]);
 308       fprintf (stderr, "\033[43;30m%s", bfd_asymbol_name (symtab[min]));
 309       if (bestaddr != mypc)
 310         fprintf (stderr, "+%d", mypc - bestaddr);
 311       fprintf (stderr, ":\t\t\t\033[0m\n");
 312       last_sym = min;
 313 #if 0
 314       if (trace == 1)
 315         if (strcmp (bfd_asymbol_name (symtab[min]), "abort") == 0
 316             || strcmp (bfd_asymbol_name (symtab[min]), "exit") == 0)
 317           trace = 0;
 318 #endif
 319     }
 320 }